Net Income Per Share Computation of Basic and Diluted Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income (loss) attributable to the Company	$ (1,830)	$ 7,511	$ (24,194)	$ 1,893
Denominator for basic and diluted net income per share:
Weighted average common shares outstanding for basic (in shares)	46,990	44,572	46,546	44,339
Dilutive potential common stock outstanding:
Weighted average common shares outstanding for diluted (in shares)	46,990	47,220	46,546	46,387
Earnings Per Share, Basic	$ (0.04)	$ 0.17	$ (0.52)	$ 0.04
Earnings Per Share, Diluted	$ (0.04)	$ 0.16	$ (0.52)	$ 0.04
Stock Options and ESPP [Member]
Dilutive potential common stock outstanding:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	473	0	304
Restricted Stock Units (RSUs) [Member]
Dilutive potential common stock outstanding:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	0	2,175	0	1,744